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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9ee927685e4736ae85254a44b82c5964e08c97569b99561dd7f5cf377c1519' 
  AND token = 'FiSygt8jSmtfGeCyA8nFDQo3AGrXqLGEK6rPibh220s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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