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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd843edb3865ece74aa8526918e5d7abc07617f88a9dfbb05779aad64dee413a' 
  AND token = 'M0iP6dTKFK4a+1SgrW3b7Y2fxazSJBKyUgjx2d6NTdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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