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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd097835e6664d217cc72f4e0baaa314e230aca00c228d7677499f5638212d906' 
  AND token = 'iOdg7E8GjLdERJ1Vwh9Bj3nyNO8x//jwhC1BA9SbR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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