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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cf843dd257353dadb5867d768e6e401f212c4d9a3295c739934180f0deecee' 
  AND token = '23OJO+K6qwwfNA8AWM5Qhw5fCuLoml2/LEY3RBjMTiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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