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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d5595b944442c871b9b25b0579b08ed16e10c5f63714c092c074f9f293529c' 
  AND token = 'DrXTvR8bC7TP4b43CrvozXvT/HP+ZaPNX01SvTP9xrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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