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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a1761f51e454357caa8d347b34179e25add114d0f15b4f13ecf53cbeb8a481' 
  AND token = 'M0Ann8fGHR6kIeWQh/0lwt2LfBylkDcNevrMqcMP7/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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