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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c9023e268df0d827296c58fb76cc594217faac1b1680c8e5052c92c3e3964e' 
  AND token = 'ikJ57i278O9OoyquTwfe7uV52JzD0ll3j2zelC6xIc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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