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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64e8234bb5e56357f250bfa7f01aec692dd54612b8bd871fc44f8d3a9b5b535' 
  AND token = 'i15evVv1mkFYlHgRaw/5mVC+yX6VuwYNIg6/fnu0mSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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