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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0af9ff9f442eb8753ac8aad27ee878a2760016ebd0870dfeb7d526a794bb5b6' 
  AND token = 's93XBC4YTxbB1y9Z6XZGJcJjc+uZna54A4MuIgH1RGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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