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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c904a5e73e286c16db6966013e9f653b95ffa139ab5f627a7f3b9ea6cd8bf1' 
  AND token = '/dYC+DcTyY3rpIkaNaeH206FNGDTd8VtfZBwwleNb1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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