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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8123ddc898a97c2e9d0606903efca87a712f3758430b6643c54acb56f86fda29' 
  AND token = 'LHWI4Ccivkzix9wI34jEVTTt2bNW3s1fn5dUWW6AaXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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