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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d10252d8c822637533bd9a01cc5373a84a40e5aaf51066e3de01ad9a5a8f1a5' 
  AND token = 'mecSip59d+sC0JvwTCWVV1s4E7VCASjnX4E7DM4lFWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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