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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1bc28f77b535ba83213893588ca1d25591690945038dc25a8fcabf3bee3559' 
  AND token = '8rLp0vUGSfEWa9JEPlkpDzzWl7Wfiog3ILIsrV6uLu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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