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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63b0c2d995efc9e3cada57c23d263a070908e2359d459b9c639fa752f6103c8' 
  AND token = 'D0NLyHn3WYtmsaz+HJhcR/g3niTIRZwDybLamW3pjGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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