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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed34d298cf8768249d3bc58fc88b62afe9354d0f997efbbb837a9cacd2490f9' 
  AND token = 'gV+LmWhZwXOyLTIRxoy+fJl9riweyf0u2+FHDcM+Xcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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