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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea76fe5fc5269c17f6cd9dd01e88782ef5e9f66e5ab1645fdc69ef9520c1cb60' 
  AND token = 'HicXN4FSYdmCZZKgSc0FE5GitNGraCfs+vi4FFGahvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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