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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692a3ae6a18d29568b0c784810922755efe3802adb37f440482784c23255333e' 
  AND token = 'VrzO3n1Tnq4OF4Id0hbEge+z5J01DXgY2+F4MArXniY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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