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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802bdf20b0354717583a960562a4028c3ad451c3991d57b83302a788252cfca3' 
  AND token = 'vqW4SrbTs1cNuWyohjWd+NZ6vFbVtkfI07+JrHmISo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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