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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c052510a0b12a024d4b87cb4dce9ff655de8f982a9776aef283cbfa2cec3e172' 
  AND token = 'didezciJ+w7iC4PofeOBUlHb0meaK9tPSTMC+Wv+sQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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