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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1021a9fac9bd5ff77719d66e7f454ba7f102d3d30889acb8ff92dfa1dc2b2ead' 
  AND token = '4XWLan6psK9e1KaEh12FuFEtNWazbmo01Og3kjcLuU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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