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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7013a768fea53f509b5dcc7c618b4f67a8b07431e2eb2674901fba4c86386820' 
  AND token = 'bLvr3hkR3H1hCRBfJKJbmfOZ1yvSugR9F25rwkoo4X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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