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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91101b7391fe5b61dd6c8b46bb0ac9825666290eed78f950a4ae9b7354f0a43' 
  AND token = '75MOp9+TSWRPjSYyWjjTZLbH3vad4TlsTvzQh7iniJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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