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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf74ccc4a03d764d2f388efe62d9214b638e3cd31e65ed368f63fba287a0d36' 
  AND token = '262R2IpN2Ipe7dA+1w7N3n080lvFoO6ZPZPvJdTDXfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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