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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3454fefe734fc683734061095e55a7260c3a088e13432c547f4354e9dad51eeb' 
  AND token = '4pSTrrodmkHDMXTuuwFVBQSzNms0q+phu3P3ueiL4t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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