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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ee2a8f1291644ee1fa468d22fb685494861d4a69a53de0ba2c552145174dd5' 
  AND token = 'H93zTDEB/ZggKta8Oy2/DTbPdYISZszQQUDC3hXYm7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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