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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9874a911e49e4c0d898186556531db431d9ad6aa69e8a3491246958f48e5d625' 
  AND token = 'ZGFW5NwnRjlF5fIETh8lTnVPrOOWKrAlF4i+7ps2DFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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