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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28108fe142fb9e0e324061def8cbb21d29e6b6f67e16b6cb08d683c0f47ae69' 
  AND token = 'KFwGscH25KdLbRNa+JqzrXV464ux27rKZEZA5ZlHsQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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