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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b63cc290a0937f628edf24944556f7b66f00f5637e0cb28e47a50d566b6cb02' 
  AND token = 'ukf9yAULqJ/1cyhgWNVNLWP4wdRA2GAwjjdxq+dJ6qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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