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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01dc53615f0e0f9aaafe0d2637ea7025bc59b90115f2bca05b600c4d00a4684' 
  AND token = '8AdL+y65QIKkMVdaArwyfWFkb2dkTvL2IN2KG40y9jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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