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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3d3a109a17392cfacdab3cf166d0be9f255caf569e97dd62c7510f826f438d' 
  AND token = '9aE9u0c5SfDXYKAQ/MYCjsDYcb+kzqzleL0D3ouyokE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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