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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b668e6832cf631049415b18b281fb93633524f4edae4c9f91a998a1c7a3c996' 
  AND token = '33yRs+tELR2a39dwlNn/JChiTgJqXVdCM2xdddTTVFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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