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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffde32f6725509e3aa56406f55f39f75e3c8c65a6cb1fbf84b58bac4eb68ec9' 
  AND token = 'LY4lQ1NMvdhetQ7Z7Oyy0PAoQ/h6UTAQ9FGOuNpCSNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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