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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b040ed5255c484493f809e2745d1fe0b5e0509f33614f7d9692e702b38d3ba' 
  AND token = 'FFgtQJFZAoIteOlFDtR+oL4v5KG4gGE2vJKSNqLWbjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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