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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951e6de284f808f9c901d2a42ffa7f3ef30eacd867ed70634f25fafc95214a7e' 
  AND token = '0UYfGRRpRLLdq01LS5eIwfVy4jzjRZDdCsTHa/1cX1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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