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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785f46cfb1edeccc8816d5eef190a66e859a1d96417a38f13793d787d875c365' 
  AND token = 'BkH9G+NOQX8cJPKtu9gH1nWdmdjk8CToBk2a9yzxRes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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