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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b85a9116a583320d4eef08f231f4c1783f4a63cd165f803f0a35b77f5609ed0' 
  AND token = 'kT+RyMRTEuVP3se97gdOnDMNhfQYGe6mhn4aPPkQQ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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