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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae737fde947dac729958ee503f6cf5ead49136089f2e1fc34ad05c28c0d9084f' 
  AND token = 'TS23VdmdTh9ZF5wsGded9tnGvMuqrivkzt6p2R95pfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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