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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1adc97cbee2ed11aa9c445409c2f5c2cec9d6f404e128f48ce8e256dd1654e2' 
  AND token = '3YQg8ifWjBKdVLyPdNdFojuufBiD6rEDyvhll812YHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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