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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7701350871b4594ad2be041d4156a4d3a738f003e0314037a1a956b99f73eaf8' 
  AND token = 'K2sq0oubVcjbX+TPL88yqjznq/+Vz3JaNhSk4oiExi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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