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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983c6ad594e83d7d6ef5e7a6b4dc1b5dca3e3a970e7235cbd629e2a7c07ac0bd' 
  AND token = '9wnj1vI4gGfLt0f2PE5dIgOyXNOWDosnpqPQ7E+9UPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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