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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fecc2ca1355f95101982289575e69b03644e0a4380a5535eed07e541832b526' 
  AND token = '8jz6AAVZJlyrAzluDMLY3f2UQ73xga6z4Fb2bQAf8TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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