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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b990bf227fce9ac64ab0865ef22a36ba1bd711e426c442579f10503566d54e' 
  AND token = 'JvED0Af4lbUxr3dstg4O7bjazlDWl/2iFrKSr/tTQKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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