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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4c97d5f381b367515f5b03311f26eba4fbf56c45877824c8a6931db59432ed' 
  AND token = 'KNSubX0tqsZ/uDFknoqJitw+b6/TcM9ketYHEFdWolI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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