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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590b0bdebb0c0fe4e8429339117c4410162a2bc4d72cdf6f9fcdc5439f098e60' 
  AND token = 'G4scTz4DGVXDy3eZLBqvvBWhOO6lwVVdqXsce4jVvAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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