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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93fc6ece7054a2c5cd08cf5fa2ce385d73219f8e219e244d25a8122e34ba7e3' 
  AND token = '2oC3Qp0z8q+Sa+yyZSG0IFTxLreQVZr1Tf6L89qV0kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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