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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719a84026b208365e635f8d18bd935647febd7311d26a13d7e3670326452cd08' 
  AND token = 'K98GzY39MRxByPvnDNY1ikXMvi7bqItDkR5bCWri6L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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