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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab318f9edd552d00ff40c70a48258d66c1365e899b39b6139dca192d9075ec2' 
  AND token = 'Y3tvRs+qb5baTu8YioKNhEStYD0/LaHuEYxZ3ywNn9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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