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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b669031deec50996f106e0cd37c1b4e4bac9dcd4c816bb48fc8da3267c0f3f2c' 
  AND token = 'M7nMM9eSXNzQUb/EQO+G0cc4PPVkRJ03/9KlX7nEdvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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