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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d8bf77c0a3909b501fe95bb312d0fe68860bdd9ea551c9603a82c16ba74f01' 
  AND token = 'upXfOtUg2oy6u0KnXHChiEpQ4tKe1Xz519vF6Ik4mko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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