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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aaaed8dec0c5e9c350423036e0492cda0edac4c50f18cce5afeea102a491dc1' 
  AND token = 'TUScpiwg9QOZUhQvYXpkqcbXMzuhr9t5C5XKHi+N2iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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