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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35324a77cbdf994f369a01ec8f26a46c3b1050347f18dad5601a4d19a7a32b62' 
  AND token = 'MIFX7OrMI+R0oudAUV5Wz6mZJGZUzcIw0sR4XqN2iVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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