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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f5d82411e79f17ed9952658af13ba1adc71fd867bd8ab67d50d4243c455925' 
  AND token = 'CT0xJLwzTerMXaHAR7a6+XAO2f6pYfTEVuM9KaKufQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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