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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049d30c04b7f24a0f3c804814049d0dcddaf10bd45416b7fa5c9f84ff0305fb1' 
  AND token = '3zB1j2xJS3Qoymrdko+36dRkSGNBtKSQnY/wZxz0wS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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