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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac708263ec970d57742512b940706d7b7492cb9d27050eba851f3c8410c0a2e1' 
  AND token = 'mzbwuMj3dqERED20BA6vIGR84wUyFMa/jLSMcEs1c8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}