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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8262f00b90d5d27f3d8cdf1c3ed23e880e9707ea237b4c825dff79f947b8887e' 
  AND token = 'v6hy7mygapRSgGNfQzCZmVnginmzW3Fw4T8f/cJmiAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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