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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8228f4f06c2ec3cd0eee50ad15b50a93f5b54be787ae1dd19c02eaf34f9d4e6e' 
  AND token = 'pTCTS+Id+FSrGuJppjCJufJRoROAVQr+siQhQpyxA7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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