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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b001eff9a28c99bf1936f9826309498275ea7c710a71369e503531f45f08de8' 
  AND token = 'rBOkvGbluzHnkJnU5I5nRH0RI6A/AhqTxN4veYOp1Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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