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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39703c78c26ffd3864bb85d71d2d676032b5c0908a68a52e16cb405f683edc8' 
  AND token = 'mKgMV0L6+3AXTZlD97ro5wVr9ntDz+uJJi25xWFwS6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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