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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbd5c18006b92befd85ec3827340eeaf103bf6118d637ccd875d36095d645e8' 
  AND token = 'wgSJTEF+PgOXITva9eR+glODeiKf6VC4I5m7UGhJlH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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