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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30d7ca0ade27dde2a51c70fcfdd266c7bc9d8f521cf44b629fa2b60f3805c82' 
  AND token = 'EKZLoz3vhScQ0mH8a5fWndr1/P+tFMSXdHJWJHbhuPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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