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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2ac41b7f7561983dae0794efe582336232797a9d79c15e48a24a239a1a65b8' 
  AND token = 'ip/GM8DEYiDmVoS0R3t406lQG+rGYEdXXaKZJTSx1OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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